OOP in IEC 61131-3 for experts

Elegantly solving the handling of data and call information with OOP After the introduction to object-oriented programming in automation technology, the benefits of the use of interfaces and the inheritance of function blocks was explained in the second of the series of articles. But how does one deal with data? How does one evaluate information about implemented interfaces? With the answers to these questions, expert features of object-oriented programming such as those available in the IEC 61131-3 programming system CODESYS are described.